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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
INVENTORIES    
Chassis $ 7,721 $ 6,561
Raw materials 40,014 39,444
Work in process 17,179 16,520
Finished goods 27,727 25,440
Inventories $ 92,641 $ 87,965